I've left it sit for 30 minutes at a time, checking for life after various inputs. The "manuals" for these pid controllers made in India hardly deserve the name, I've learned a great deal more about them in youtube. I'm hoping for a description using an i-Therm PID controller of what buttons are pushed step by step inputting a simple program. Let's say start at 20C for 5 minutes, ramp up to 300C, hold 300C for 1/2 hour, then ramp up to 815C over 30 minutes, then hold 815C for 30 minutes, then shut off. The one i-Therm pid video I found is done by an Indian with heavily accented English and very fast too, so also very hard to follow. BTW, there is no toggle for Fahrenheit, and that's according to the manufacturer.
At this point I'm considering starting with a controller I can afford AND which has a manual (and or a good video) that's more clear, then buy that and wire it in place of the i-Therm.